Pink diamond
With a mass of only just over 3 g (0.1 oz), this jewel –
known as The Sweet Josephine – is one of the largest
pink diamonds ever sold. Diamonds are normally colourless forms of pure carbon, and if there is
any colour, it comes from tiny amounts of another substance. For example, boron makes the gem
appear blue. Strangely, pink diamonds have no impurities, and no-one knows why they are pink.144-145_Carbon_DPS.indd 144 02/12/16 7:48 pm